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A method for separating rare earth ions by magnetic polymer microspheres

A rare earth ion and rare earth ion solution technology, applied in the direction of improving process efficiency, can solve the problems of slow mass transfer in pores, unsuitable for separating large volume rare earth ion solution, small adsorption capacity, etc., and achieves broad practical application prospects, Simple and convenient separation and recovery, the effect of large specific surface area

Active Publication Date: 2016-08-10
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the solvent extraction method for extracting low-concentration rare earth ions has disadvantages such as high cost, loss of extractant, and secondary pollution; the ion exchange method has disadvantages such as small adsorption capacity, slow mass transfer speed in the pores, and low efficiency.
Therefore, the traditional rare earth separation method is not suitable for separating large-volume, low-concentration rare earth ion solutions, and a new method is objectively needed to solve this problem

Method used

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  • A method for separating rare earth ions by magnetic polymer microspheres

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Effect test

Embodiment 1

[0019] (1) The prepared particle size is 20μm, coated with Fe 3 o 4 (particle size is less than 8nm, mass percent is 20%) magnetic polymethyl acrylate (PMA) microspheres are washed 2 times with N,N-dimethylformamide (DMF) earlier, then take by weighing 3g microspheres and add in In a mixed solution of diamine (EDA) and N,N-dimethylformamide (DMF), shake well, and stir at 80° C. for 8 hours. After cooling, the surface aminated magnetic PMA microspheres are obtained by magnetic separation and washing.

[0020] (2) Prepare a lanthanum nitrate aqueous solution with a concentration of 50mg / L in a 2000mL beaker, and adjust its pH to 3.0 with 2mol / L hydrochloric acid. Weigh 2 g of surface-aminated magnetic PMA microspheres and add 1000 mL of La 3+ In the aqueous solution, the adsorption reaction was carried out for 15 minutes at a temperature of 5° C. and a stirring speed of 100 r / min. After the adsorption reaction, the magnetic microspheres were separated under the action of an ...

Embodiment 2

[0023] (1) The prepared particle size is 80 μm, coated with CoFe 2 o 4 (particle diameter is less than 50nm, mass percentage is 10%) the magnetic polymethyl methacrylate (PMMA) microsphere is washed 2 times with DMF earlier, then takes by weighing 10g magnetic microspheres and adds in the mixed solution of EDA and DMF, shakes Shake well and stir the reaction at 80°C for 8h. After cooling, magnetically separate and wash to obtain surface-aminated magnetic PMMA microspheres. Weigh 5 g of the aforementioned magnetic PMMA microspheres grafted with dendritic amino groups on the surface. Added to 16g carbon disulfide (CS 2 ) and 30 mL of 6% sodium hydroxide (NaOH) mixed solution, stirred at room temperature (24° C.) for 2 h, and then continued to react at 45° C. for 4 h. After the reaction, the magnetic PMMA microspheres with dithiocarbamic acid groups connected on the surface are obtained through magnetic separation and washing.

[0024] (2) Take by weighing the magnetic PMMA ...

Embodiment 3

[0027] (1) The prepared particle size is 120 μm, coated with γ-Fe 2 o 3 (particle diameter is less than 30nm, mass percentage is 18%) the magnetic polystyrene-hydroxyethyl methacrylate (P(St-HEMA)) microsphere is washed 2 times with deionized water earlier, then takes by weighing 10g magnetic microsphere Add in 20mL thionyl chloride (SOCl 2 ), react at a constant temperature of 80°C for 8 hours, then add 30 mL of absolute ethanol dissolved with 8 g of sodium p-nitrophenylazosalicylate (AY), and continue the reaction for 24 hours. After cooling, the magnetic P(St-HEMA) microspheres containing AY groups on the surface are obtained by magnetic separation and washing.

[0028] (2) Weigh 2g of magnetic P(St-HEMA) microspheres containing AY groups on the surface in a 5000mL beaker, then add 1200mL of 420mg / L neodymium ion aqueous solution, and adjust its pH with 2mol / L hydrochloric acid The value is 3.5, and the adsorption reaction is carried out for 15 minutes at a temperature o...

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Abstract

The invention relates to a method for using a magnetic polymeric microsphere to separate rare earth ions. The method mainly comprises the following steps: preparing the magnetic polymeric microsphere with superparamagnetism, modifying the surface of the microsphere with functional groups capable of forming chelates with rare earth ions, so as to use the microsphere to separate rare earth ions in a water solution; and desorbing and recovering rare earth ions supported by the surface of the magnetic polymeric microsphere. The innovative point of the method is applying the magnetic polymeric microsphere to separation and enrichment of low-concentration rare earth ions. The method is simple and convenient in operational process and fast in separation speed, and the magnetic polymeric microsphere is large in adsorption capacity on rare earth ions and high in adsorption efficiency.

Description

technical field [0001] The invention relates to a method for separating rare earth ions by magnetic polymer microspheres. Background technique [0002] my country is rich in rare earth resources. It is not only a large country of rare earth resources, but also has become a major producer, exporter and consumer of rare earths in the world. Over the years, my country's rare earth scientific and technological workers have developed a series of world-leading mining, selection, and smelting technologies based on the characteristics of domestic rare earth resources, and established a complete rare earth industrial system. At present, the widely used separation methods of rare earth elements mainly include solvent extraction separation method, ion exchange separation method and so on. However, the extraction of low-concentration rare earth ions by solvent extraction has disadvantages such as high cost, loss of extractant, and secondary pollution; ion exchange method has disadvanta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/24C22B59/00
CPCY02P10/20
Inventor 王强崔大立黄小卫龙志奇徐旸
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG